I have an AVI that has a 3 minute part that the client does not want in the DVD (last minute) is there a way to cut this put in DVDA or do I have ro rerender in Vegas?
If you didn't render as an MPEG in Vegas, then DVDA is going to rerender it for you as an MPEG; you just won't have as much control over the various render options.
As far as your problem goes, pull the movie into DVDA twice. Set an out point on the first clip at the beginning of the section not wanted. Set an inpoint on the second clip at the end of the section not wanted. Set the end action on the first to link to the second.
This will work, but be warned: depending on the player, there could be a sizeable pause. It would not be a seemless as going back to V5 and trimming it down and putting in a proper transition. Note both the video and audio with disappear during the pause.
You don't mention whether the three-minute section is at the very beginning, the very end, or somewhere in between -- ie, do you want to chop off the end or beginning, or do you want to remove a section and keep what's before and after?
If you're just chopping three minutes off the beginning or end, you just set the In / Out points as needed.
If you're removing a section (leaving what's before and after), you can go with the other suggestion in this thread. But, really, if it's still an AVI, you may as well take your rendered AVI, drop it on a Vegas timeline, edit it, and render it to a new file. As long as you're just doing a couple cuts (and even if you add a transistion between the two parts), rendering out the new AVI will take almost no time at all.